package com.example.creatation.singleton;

import java.util.Map;
import java.util.Properties;

public class MainTest {
    public static void main(String[] args) {
//        Person boss1 = Person.Boss1();
//        Person boss2 = Person.Boss1();
//        System.out.println(boss2 == boss1);
        Properties properties = System.getProperties();
        System.out.println(properties);
        Map<String, String> getenv = System.getenv();
        System.out.println(getenv);
    }
}
